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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe16e0891ece29cb6f2e5c7f92ae1fc3970b7f2f2e6e1b38e567cf56fef47b8f' 
  AND token = '4a8HaD9rqLnDG4vP/YQl9ESHSKctBkf9yty8pyKEjhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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