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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3d1bd389f2714446fb06bece0e66f6daced2f52f6c194975169ff832bc411f' 
  AND token = '2Ul6Ex34q1Ja/JxTNaI6YEEX+DH8d0SzOntEUbXqhgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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