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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd68fc2ae528b3b68452f684384b9eb165f3c169d8b5a5ad9c4ab8e8d667aede' 
  AND token = 'V6Cr11cQOMQnGNkOVTkCKOxT4BIBVr3Vumpv7Nn3dXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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