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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cd38b9ea62bb44637aec58e6c2ed57c70c1b98993555a125b62c055f373cad' 
  AND token = 'yfCr8foa50GAzSR0pvYuADKXSE6Katc2o36hGQtOa78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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