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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc4665858e2bb42ac9695a40f21e29c17bc39448528c3924b7970c8699575cb' 
  AND token = '2NvJRF2ErWxJsAo1Ppv4WnGaQ3vzz/Jfh9oqeuN1K5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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