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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef09164584cba5431740f69e10cd048d7724b40c294c17e440ba2598c572396' 
  AND token = 'jb5+Ts5ao5c7w9tlUW3s5ONRR1I7maUKK+RUiqHfsJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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