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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326fd02404e79a30af53901f5937ebef3a584dafaf7b4ad2ac0bc4d0a3fe7548' 
  AND token = '8ZNiprAq6/kDzbo+y/+u5aFLJwTSgW0U6jap4cbY6IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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