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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f134059b52433a3866f2afaf22ff5bf8c5e73796fe43001c3a2251395fc1b6' 
  AND token = 'NOsTOSvZiqZd2nrG+UyYAY7al9BmtCNxY9NNX6DZvs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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