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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0daf364d7ccc78e6c3fb21ec3fbd1dba213cb173129516c3cfa4d260274e23' 
  AND token = 'gD12KReNxrJ+sQedcM6IsiSMLZhv0nm7osg7LH2rh2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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