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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7652a46cfa4dc121d82515347e37450d29b814fa643588d369fddf80b496a8' 
  AND token = 'SYp5DCzsLhJ9Cm2GWRLi0sQi8EJdCu+DXknvxYSfUxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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