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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31899b82db23fc3b9a3dd1a2c8bd16d40f1a6ddfe051f93e067ed2242f409e8' 
  AND token = 'AQxBZXPVhKWZ7WC8ZDSyHDvKSi2Qa3sJUXgoU8CRQ+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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