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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f38182cb794b3c546793cac0880634f7e8337699f86dc4406a26f4ffa044834' 
  AND token = '923W8LeGRrPkf7iX9igpRJaMTLw3jh+3eATnOaXjJQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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