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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '525160ccf11aeb9aecb66e11b30f5f421d520b2ed5bfd0fcd3503c1f129b8617' 
  AND token = '4fG4dGjHmORptz2uPzHpE9EHtyH3xUmCQuQ3v0xUlyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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