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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1b7c59c836096d8c71d5b58180a9a95cb399021a32bcea63496cc5db2d7041' 
  AND token = '/vB47f8Af7cPrdiXuFdnbqgdrbGULA8C5Exa1rC0iak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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