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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de60f617bba5636417df2a1c9a7e103d71660a849a57db7f5e4ee03d6c2cedb' 
  AND token = 'muQlQq9rPJiK9ctT4QNMQIr5+t8T78554Q16SC7Cm78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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