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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662eed352c2f0019756b0ecc7a9a220550ef98ba2ea9948d51ec0fa1b566974f' 
  AND token = 'RcABCA4kHEE5jFoXI0WqGXE9cFQJU76Ev1u5yPKD9Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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