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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05febb52bca90de0c76c7a24461e1a463fcaf0ea8a64531357f40e266344c4f' 
  AND token = 'oEnyrqpGMjPZ9S6swJrQcXYW+TN3TPy6dPs7NCMUjTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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