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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b14b2a78e34b7e6104a72e9c4f3762e802f3b3c91dfd75b4ce06990ebba439b' 
  AND token = 'YlrdcZtwGdFLMaHh8aCuXpKzWVl0NBGe9SJlnuE1Nss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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