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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a4d5b484c1067d9f69772692ceee7667c52a5af2625933caff5a9520a40617' 
  AND token = 'MvNKV7ksYfdLQ9goXSl7InOaIgAfRFWAJjCzUjDlpvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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