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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cc6e50e646d262fc18eeff313ce9f0e2740062f572bbafc15412dfb7016242' 
  AND token = 'g5zOam5pLvPv5McAoYNFBKf87Ez2yI+Hkh+ck6YisJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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