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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ffd5b68e435a91cc2c5aa80e516c744e69f3deb67b3d9ad93a4454058986b1' 
  AND token = 'D/ZEkU09rgfemUMpCjvExHQk5ORUeKKc/Tjm5kb8PDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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