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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac7550b9bff1af9eb8571f430e65a43e5bbd0bc2805a9113133d476d6d88bcc' 
  AND token = '2PBlASEeDb1misNfmPfsjhcZzXR11rrGWQcmn9zJqWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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