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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d6d559f44723a39eb0dbcede27fabd47e7c63f1290ad2be37b5c5bdc7a9554' 
  AND token = '4nrwOTdM7Hk72q6q5oRHTN7uOYrH4jX1OudWTaYgE6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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