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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724067d2430096f809def03c95e208516445d84af6ad99c3953bc068db6b0400' 
  AND token = '8LKU0VW3gGTMT5Bny5hqNCD2ZdXiodqdSuEXa+aJNIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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