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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6d68f526af12e92b37a226f834f828b705194ffef100eeb945f6ca0bc77636' 
  AND token = '77OGdlRfQqJ08hc+8YuzEeOETVLZ3xg8J+Vo1AMfTwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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