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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1514760239b7e446008f8e6475390a98be77d1832ca02f7600242c2bc35d2e9' 
  AND token = 'cggtmo97OV1SRlSUiVmYtBX0DFOGVUD9XU/yUCGTFEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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