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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b592dc47049b9cb1c64c8694e17a7c655db76125961833eaa004ff712710a41' 
  AND token = '4+rB1qI/oeGg7rQK/6EZf+fFh8OYyo+deEh7be0V6S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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