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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3c5ddc1ef055d97d6fd5d6cd589000b8a57ad7e5aaeef74092946367e0a2ee' 
  AND token = '/wD/R1/28V8FcfTBkTK9I7asGM3wsv5jA9DJzQIYNS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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