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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af86bb6609e702a1680fe1addca81a48bcd669600e33f42fc7cf5658982d4610' 
  AND token = 'RYIMy6voZK8F1Vb81gZNAv21Y9LAFphEGpkjpZydMZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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