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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e42bedd4e51c9b2b2c18dd6b72b654fc8b95b7f963df1ea0d2b07c7ffa1d85e' 
  AND token = 'MbJT6Psuwk5vcPbMxPI5m6EWEzYcxDJ3Qoaa768VT8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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