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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc693d149cfde4eecec5f23743270ceed080221c343ca72b11d14655d2c0fe01' 
  AND token = 'TnIPICCTb/SkSL/nVMc3AXHFxzinTJmZzcGUD0w6bFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}