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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc929ffa8ca0514e3b11e0cac63243787593d19806bb6206a584111c3657630' 
  AND token = '64dn31FlAs1RUhpxcVV6oQAm7E9jIEOQ+DfHNHpYJq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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