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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b7ae2ebf5e5ac853a8136b64159e4884253b5b9eb837a6db8e583882414240' 
  AND token = 'OzGjRNbuS/irNnEm6BDk0iKkDbhRuOyRuPosrO6UGvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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