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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2f93adcbb50c89870e8d536b82e5529ea85699673d467350826c6e63cbdbf7' 
  AND token = '9C1YiCAp8rdB6fi+ceqx5Dca6oRpJ9NFz52VqZVvsIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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