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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f88771f5ddd3c2fe39cf86fcbe5bc71665f7e602ad7cf8472bdbb1a9a8e200' 
  AND token = 'H9dkbX6/CrUhbU0DZVUU+NHWNagEtOoZhn68udVe4lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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