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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e8405dfa976da7f1c7da6119d564aff7cf6e977aa513ad8fb552f6ea5b5812' 
  AND token = 'BiXdmWx8eNFe+I4V6oLAld1xgMWoohqK2qtxtTFzL2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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