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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde31ea38fc1ee99f9ea6b39de35c8fdb11a0007969689b6ef274b65cbeb596c' 
  AND token = 'xE1fRCs4+Fufya95r/YMeOPcXMrnRQ2p9muir0u2UoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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