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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a25400bc8f571d7c804096f24793cac3d1485fb3d13e707571b4dfbec55e4b' 
  AND token = '6NLLwDEKa1auS8iXZEs2Y8e6XhN2swAS4+oL7UvlHa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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