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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25028f8605599bfd4e93c75c3b36530f62a61aa9570fac8eb5a8b332dbb8355' 
  AND token = 'JA8RwK7VEAVY7XeSJEyhwFy87sk0H9D1Kt9cds6Gg84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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