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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6995928a362a66b80ef82b377ed3962f7f1ff4c5df4421b96eeea8a7765a3c' 
  AND token = 'z7cedey7N0kEFhX7TMfughFpMqLFQzioslmDhatvLYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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