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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a65d2a456472a2e586d4d80adcf968c4c777740d94e4d90cb89d63bf9bee6f1' 
  AND token = 'GBkYonisVl+0gcF2cy9LOXJNz6FXdqFn5I8rNddwyrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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