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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc699633e0cc641f11f0ef6680816883b3dc61cea97134fa241dab89d43ccc67' 
  AND token = 'Zfo39JsPK8pmt8lbhLkhZmdv3TWwUvhhlr5dGJayfJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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