SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5838d156b95266d79a22fb94722ca03f974040ad0732646b55ff86a87bb3dee6' 
  AND token = 'SUVYCQlt8J8WhJU5fGLB/Le1+3noDF5ltJAi4OJwcsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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