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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7445f8dbe9f19cd7afe61ca99d14d236d1bba7c8ed456c8996ef5bb2b49bdeda' 
  AND token = 'imBeabAx08erYjzFJVMkw6tOCtCBTcDGRAbTv6BPsQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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