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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba35b94d4fc30223099ffce3112cdc2010c830db80757b057399a03e0a5b78d3' 
  AND token = 'roNUitvZB3sxwFiOGA/+YvBZe8SRJl17jcrMzEZtpfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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