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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebcad6b0ec702b700791178f47c708f08c77ea2cdae18cbfc7f684687a9161a' 
  AND token = '85MnnLVZqEqAoa5JxKjXZL8lOO886ot9FCyE+kiKhQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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