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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a127bd8e0da7211b5efdd945ef7c317c19addcb6c1f04e1f10d7bf72e5ba34b0' 
  AND token = 'meZbBv3zUB2JLN468MpX/ttcVSs1Ex68rAxJOxB8+zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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