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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ad1274627768f40ed9dfa541ee6d44e047f95b4322026673b29af20994f710' 
  AND token = 'd9V2ht2lngxaYIz4BdcQ7UWlPcvwKjgC/kHaNILvMHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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