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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88da2c788531afd56743a35a41ad808c338ee1790214befd1214b0bb7cd7e98' 
  AND token = 'KB7svjX6C31z67G4/JruDD+wiX+e7xBDv24NbasvFUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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