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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560ad06ed43d51807e71da2ace8922a9a0eca44dc6377d68bb7b1cd4ddbabb4b' 
  AND token = 'gyX5LmtoBRDmiGsL2T5h2hYyFct5wPEleZPSzs3TT68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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