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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7866d1f48daae727637fbff93f92448b7668a65da0dcf74126dd83f0b1ec92' 
  AND token = '08NVIfp4IBNJTvtDjPiARIdAEWCkA2UNzT9EnMp1S5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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