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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1aadc0357a1e2cd7332410b8b0b3915b331183f13983c2eb5644421f5a21db' 
  AND token = '5gqPae86NLrs9h1Jt63ABmHQNyHQijaGUvcWqoOdDBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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