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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aab5a9b9f17d0adb1df6b5ede6531b03a1e76df007b52ef686cb5f9ea0924c6' 
  AND token = 'ysslGEOR7u6g+26kcgONnqyGiQhbxJid1QNgdGDVZpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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