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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5012e31c259efbbde2bf24f3c7ef3e5f1d8fdb482a96c5d854e319952f92c3ba' 
  AND token = 'RDogwvtgyJGmoy73MLa92WSYnn7TJvaWdBeR3T6+HE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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