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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fd96e11f0167a81704feb2c985fe1e7f95a603647d0da9582f72664168a71e' 
  AND token = 't6v8asTd51r965Q12AfQDHg8kqd+kaOLhglpcbw8dVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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