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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3654b3155b60cd498bc785cafb389363c17afbe9876981a3afdf65f388d732' 
  AND token = 'UuM8wA556VJJhtlDm4WZQXztNnpdD+n///1wL35ORZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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