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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9193acfafcbd5fd2bde01a5e4f2e2aef830b851daa37e78efb07329c4ac8c82d' 
  AND token = 'LESRj9SFYsytxKUgxRgFyJMDVc4E5AMgb6wr5EIIT+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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