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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd40becd2369f1d37813a606ce5777199c6eac384ab169dd33295c35466ba6a' 
  AND token = 'QY1jfc311IcAOTFIkckL//UV/zCPboisf0h7d5xIu4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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