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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5731e2f0f918f4161594db4606597d1faee647c389cb1f4802176453c3c56c59' 
  AND token = 'mS0iQS/dbsXbufHXqf22LCDpd2EQKh0bUfewGdGvo5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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