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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad59da2092988a76d8c0152238c39facb7880a8993f4d428a956e90a110b834' 
  AND token = 'dNPOSfpZ3Zpf3jUd2F6zZfy58RQgJiS4uex9pIrwNF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00238

JSON explain

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