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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ddfe50e76f0a3cf12999cfb3a1fd3e29b60cd945e7594770a20d471470089c' 
  AND token = 'seOeywBUbey1zKhRVi6M97BsSQR7WhSMj1riwunWwYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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