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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64be6467cc0a123118eb5d837a4607c3ebe8369e9f93ccba061d27555261ab6e' 
  AND token = 'qgWK2I1s7eXr7fd6UzM79qEtlC+l6i838I9OIjdNxTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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